android - How much can I scale the image's dimension after a quality scale? -

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hi guys brand new topic , i'm rooky in image stuff.

i need upload on webserver image user's smartphone. before upload operation downscale image quality jpeg 60% of quality.

after quality compression can downscale image pixel size without losing lot of overall quality?

is there equation can give me % of pixel downscale can if know dimension in pixels of source image , how i've scaled down quality?

thank much, sorry if question stupid or obvious said not main topic.

the quality percentage in jpeg meaningless (at best qualitative) figure. jpeg "quality" values translate quantization table selection. jpeg implementations use numeric range scale base quantization table. resulting quality of compressed image spends upon nature of image being compressed.


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